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Modern semitrailers for the most part do a good job of keeping passenger vehicles from sliding underneath them, greatly increasing the chances of surviving a crash into the back of a large truck, recent tests by the Insurance Institute for Highway Safety (IIHS) show. But in crashes involving only a small portion of the truck’s rear, most trailers fail to prevent potentially deadly underride. Earlier research showed that the minimum strength and dimensions required for underride guards are inadequate, prompting the Institute to petition the National Highway Traffic Safety Administration (NHTSA) in 2011 for tougher standards. The Institute also asked the agency to consider applying the standards to other types of large trucks, such as dump trucks that aren’t required to have any underride guards.

https://www.youtube.com/watch?v=m7eRx9mWP_o Dump Truck Videos For Children Construction Vehicles Toys For Kids Excavator For Children A dump truck is a truck used for transporting loose material (such as sand, gravel, or demolition waste) for construction. A typical dump truck is equipped with an open-box bed, which is hinged at the rear and equipped with hydraulic pistons to lift the front, allowing the material in the bed to be deposited ("dumped") on the ground behind the truck at the site of delivery. In the UK, Australia and India the term applies to off-road construction plant only, and the road vehicle is known as a tipper, tipper lorry (UK, India) or tip truck (AU).